McDuffie or MacDuffie is a surname of Scottish and Irish origin.[1] McDuffie/MacDuffie is an Anglicization of the Gaelic Mac Duibhshíthe ("son of Duibhshíth").[1] The Gaelic name is composed of two elements; dubh ("black") + síth ("peace").[1] The name is sometimes shortened to McPhee or McFee. Notable people with the surname include: